SUPER TAN SKM

Leather Auxiliary

Technical Information

Properties :

Classification : A neutralising agent for all types of leathers

Analytical Data :

Chemical Nature : Naphthalene sulphonic acid condensate

Appearance : Light brown free flowing powder

pH of 10% Solution : 7.2 ± 0.2

Concentration : 98% min.

Solubility : Completely soluble in water

Special Features :

SUPER TAN SKM consists of a salt mixture, which hardly yields any hydroxyl ions but

reacts almost neutral in aqueous solutions. The salt contains strongly complex-active

acid radicals, which displace and buffer the sulphuric acid bound in the collagen-

chromium complexes.

Overneutralisation with its well knownadverse affects for the leather quality is

impossible with SUPER TAN SKM. Excessive amounts will infact improve leather

quality by conversation of any unfixed chromium salts into tanning complexes.

SUPER TAN SKM lowers the positive charge of the collagen-chromium complexes &

thus levels out the pronouncedly positive charge of the chrome leather surface. This is

beneficial for applying anionic dyes &fatliquors uniformly resulting in uniformly dyes and

fatliquored leathers.

SUPER TAN SKM lowers the positive charge of the collagen-chromium complexes and

thus levels out the pronouncedly positive charge of the chrome leather surface. This is

beneficial for applying anionic dyes &fatliquors uniformly resulting in uniformly dyed

&fatliquored leathers.

SUPER TAN SKM does not give any colour reaction with iron salts. Vegetable &

synthetic retannages have a mild & uniform effect after a preceding SUPER TAN SKM

neutralization, drawn grain &overtannages are avoided and a full leather with fine & tight

grain & exceptionally good dyeing properties is obtained.

The properties of the product described above are particularly beneficial, if the soda

bicarb which is normally used is replaced wholly or atleast partially by SUPER TAN

SKM in basification of chrome liquor.

SUPER TAN SKM can also be used in combination with other commonly used

neutralizing agents. e.g. soda bicarb. In such cases, neutralization is commenced with

SUPER TAN SKM & the other neutralizing agent is added subsequently. Incorporation

of other neutralizing agentsofcourse reduces the special effects of SUPER TAN SKM.

SUPER TAN SKM has good lightfastness.

Application :

Material : Wet blue cow leather for shoe upper.

Shaved thickness : 1.1 mm – 1.2 mm

(percentage based on shaved weight)

Washing : 200% 20 mins

Drain

Neutralisation : 100% water 20 mins

2% SUPER TAN SKM

0.5% Soda bicarb 25 mins

Check pH 45.-5

Drain, wash & process further.

Continue processing as usual.

Recommendations are based on current knowledge and experience but without

engagement and warranty.

SUPER TAN SDI

Leather Auxiliary

Technical Information

Properties :

Classification : Synthetic replacement tanning agent

Analytical Data :

Chemical Nature : Blend of phenolic & naphthalene condensation

products

Appearance : Light brown coloured free flowing powder

pH of 10% Solution : 3.5 ± 0.5

Concentration : 95% min.

Acidity (As acetic acid) : 5% max

Solubility : Completely soluble in water

Special Features :

SUPER TAN SDI is compatible with all vegetable and synthetic tanning materials and is

not sensitive to salts.

SUPER TAN SDI has a wide range of applications in the retannages of all types of

chrome leather & in vegetable tannages.

SUPER TAN SDI yield full, resilient & almost white leather.

When used in vegetable tannages, SUPER TAN SDI accelerates the rate of penetration

& lightens the shade of resultant leather.

SUPER TAN SDI imparts good fibre& grain resilience to vegetable tanned leather &

produces a high yield.

SUPER TAN SDI has good leveling effect on the dyeing and is particularly suitable for

pale shades.

SUPER TAN SDI gives good fullness, softness & uniform dyeing with medium light

fastness to the leather.

SUPER TAN SDI also exhibits buffering action & slight neutralizing effect.

Applications :

SUPER TAN SDI can be used as replacement tanning agent in all stages of tannage for

the production of heavy, medium & light leather.

a) Shoe upper leather from cow sides.

Material : Chrome tanned sides.

Shaving thickness : 1.2 mm – 1.3 mm

(percentage based on shaved weight)

Washing : 400% 10 mins.

Drain

Rechroming : 100% water

5% Chrome Syntan 45 mins

0.5% Sodium Formate 30 mins

Nutralisation : 100% water

2% SUPER TAN SDI

1% Sodium Formate 30 mins.

Drain & Wash

Retanning : 100% water

5% Super tan SDI

3% Resin Syntan 30 mins

2% Super Tan Sre 20 mins

3% Vegetable extract 30 mins

pH of float 4.5, Drain & rinse

Dyeing &fatliquoring usual.

b) Vegetable tannage

SUPER TAN SDI can be used with equally good results in both conventional tanning

system & in low-float tanning process. Inclusion of SUPER TAN SDI in vegetable

tanning has following advantages:

It accelerates through tannage, improves grain properties, brightness the colour of the

leather, levels out the dyeing & prevents sludge &mould formation.

In conventional system, optimum results are achieved by replacing 20-30% of the

vegetable extract by SUPER TAN SDI.

SUPER TAN SDI has a medium acid reserve. When combining it with low acid

vegetable tanning materials in liquor systems, it may be advisable to increase the

acidity by adding 4-6 kgs of acetic acid or formic acid for every 100 Kgs of SUPER TAN

SDI. This improves the liquor exhaustion, tanning material fixation &colour of the

leather. Super TAN SDI makes grain smoother & more elastic and is easier to set out.

The product is added in the main tannage. It is sufficient to replace 10-15% of the total

amount of vegetable extract used.

c) In suede/nubuck leather production, recommendation dosages of SUPER TAN SDI

are 5-8% based on shaved weight.

d) Correected grain leather requires 5-10% SUPER TAN SDI based on shaved weight.

e) For pastel coloured leathers & white leathers, recommended dosages of SUPER

TAN SDI are 2-10% based on shaved weight.

Recommendations are based on current knowledge and experience but without

engagement and warranty.

SUPER TAN SRE

Leather Auxiliary

Technical Information

Properties :

Classification : Acrylic retanning agent for chrome tanned leather

Analytical Data :

Chemical Nature : Aqueous solutions of acrylic copolymers

Appearance : Yellow coloured viscous liquid

pH (as such) : 6.5 ± 0.5

Solid : 40 ± 2%

Solubility : Completely soluble in water

Special Features :

SUPER TAN SRE is perfectly compatible with synthetic tanning agents & vegetable

extracts, dyes &fatliquors.

SUPER TAN SRE has an excellent fastness to light, so it is advisable to use it in white

& light coloured items.

Even small amounts of SUPER TAN SRE will fill the leather without impairing the

fineness of the grain & leather will retain the typical character of the chrome leather

despite the use of other retanning materials.

Fixation of SUPER TAN SRE can be increased with chrome tanning agents resulting in

an increase in fullness & thickness with improved feel.

Use of SUPER TAN SRE is facilitates finishing anchorage.

SUPER TAN SRE is specially suitable for leathers with loose structure for upper leather.

SUPER TAN SRE is not stable under highly acidic pH i.e. below 3.5

SUPER TAN SRE is not readily miscible with cationic products (e.g. Mineral tanning

agents).

Applications :

SUPER TAN SRE is used for retanning chrome leather to improve its fullness &

tightness of grain without causing formation of coarser grain. Before retannage, the

leather nust be neutralized throughout cross-section. It is recommended that SUPER

TAN SRE be diluted with an equal quantity of water before adding into drum. The

running time of drum will vary with the type of leather. But 30-50 mins will normally be

enough to exhaust the liquor. SUPER TAN SRE treated leathers can be dried by usual

methods, but vaccum drying is considered to give best results. The quality of SUPER

TAB SRE needed varies with the type of leather being produced. Normally 4% based on

shaved wt. is adequate. Less quantity will be needed for skins & more for heavy

leathers.

a) Retaining of corrected grain shoe leather.

Material : Wet blue cow leather of thickness 1.4 – 1.6 mm

(Percentage based on shaved weight)

Washing : 200% 30 mins

Drain

Rechroming : 100% water

5% Chrome Syntan 45 Mins

0.5% Sodium Formate 15 Mins

Check pH 4.0

Drain & rinse

Nutralisation : 100% Water

1% SUPER TAN SKM 15 mins

1% Soda bicarb 30 mins

Check pH 4.5-5

Drain & Wash

Retanning : 100% Water

3% SUPER TAN SRE 30 mins

5% Tysyntan T6

4% Wattle extract 60 mins

Further process as usual

pH of float 4.5, Drain & rinse

Dyeing &fatliquoring usual

b) Upholstery Leather

Material : Chrome tanned cattle hide

Thickness : 1.0 – 1.1 mm

(percentage based on shaved weight)

Washing : 200% 20 mins

Drain

Nutralisation : 100% Water

1% Relugan GTW 10 mins

2% SUPER TAN SRE 30 mins

5% Tysyntan TLE 30 mins

2% Fatliquor 20 mins

Retanning : 100% water

3% SUPER TAN SKM 30 Mins

5% Tysyntan T6

4% Wattle extract 60 mins

Further process as usual

Dyeing : 4% Dye 45 mins

2% Formic acid 20 mins

2% Tsyntan THN 30 mins

Drain & rinse

Fatliquoring : 100% water

8% Synthetic fatliquor 60 mins

2% Formic acid 30 mins

Cold rinse, pile &

process as usual

Recommendations are based on current knowledge and experience but without

engagement and warranty.